API GetWindowText的问题

zyc_0204 2008-09-13 05:32:39
保存为.c文件...
问题:
第一次单击菜单"双链表展示"，ＧetWindowText可以得到值, 可以正常操作.
如:输入排序字符．插入链表．（字符排序，输入字符排为１）
第二次单击菜单＂双链表＂，得不到值．怪！










//代码
#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
#define Node_Btn_t 104
#define Node_Btn_h 105
#define Node_Btn_add 106
#define Edit_value 107
HWND btn_add,btn_t,btn_h,edit_v;
HINSTANCE hInst;

int j=5;
int d=0;
HWND hbt2;
HMENU hmenu;
HMENU hsubmenu;


typedef struct Node{
int location;
char value;
struct Node * fore;
struct Node * tail;
}Node;
Node *head=0;
Node * CreateNode()
{
head=malloc(sizeof(Node)*18);
head->fore=head;
head->tail=head;
return head;

}
void AddNode(Node * head,Node * t)
{
t->tail=head->tail;
head->tail=t;

t->fore=head;
t->tail->fore=t;
}

int SearchNode(Node * head,Node *t)
{
Node *p=malloc(sizeof(Node));
int i=0;
p=head;
while(p->tail!=head)
{
p=p->tail;
i++;
if(p->value>=t->value)
{

break;

}

}

return i;
}
void sort(Node *head)
{
Node *p=malloc(sizeof(Node));
Node *q=malloc(sizeof(Node));
p=head;
while(p->tail!=head)
{
p=p->tail;
q=p->tail;
while(q!=head)
{
if(p->value>q->value)
{
char c;
c=q->value;
q->value=p->value;
p->value=c;
}
q=q->tail;
}

}
q=0;
p=0;
free(q);
free(p);
}



void mainx()
{
int i;
void deleteNode();
Node *p;
if(head==0)
head=CreateNode();
srand((unsigned)time(0));
for(i=0;i<8;i++)
{
p=malloc(sizeof(Node));
p->value=rand()%26+'a';
AddNode(head,p);

}

sort(head);

}

void deleteNode(Node *head)
{
Node *t=head->tail;
Node *s;
while(t!=head)
{
s=t;
t=t->tail;
s->tail->fore=s->fore;
s->fore->tail=s->tail;
free(s);
}
}

int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE PrevInstance,
LPSTR lpszCmdLine,
int nCmdShow)
{
MSG Msg;
HWND hwnd;
WNDCLASS wndclass;

hmenu=CreateMenu();
hsubmenu=CreatePopupMenu();
InsertMenu(hsubmenu,1,MF_STRING|MF_BYCOMMAND,1001,"1 双链表建演示");
InsertMenu(hsubmenu,2,MF_STRING|MF_BYCOMMAND,1002,"2 迷宫探索");
InsertMenu(hmenu,3,MF_POPUP,hsubmenu,"游戏选项");

wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(GRAY_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(hInstance,101);
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName="ok";
wndclass.lpszMenuName=0;
wndclass.style=0;

RegisterClass(&wndclass);

hwnd=CreateWindow("ok","菜单",WS_OVERLAPPEDWINDOW,0,0,800,600,0,hmenu,hInstance,0);

ShowWindow(hwnd,3);
UpdateWindow(hwnd);
hInst=hInstance;

while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;

}


char * turnstring(char c)
{
char *s=malloc(sizeof(char)*2);
s[0]=c;
s[1]='\0';
return s;
}
void drawnext(int i,HWND hwnd,int k)
{

HDC hdc=GetDC(hwnd);
SetTextColor(hdc,RGB(255,0,0));
SelectObject(hdc, CreatePen(PS_SOLID,1,RGB(255,0,0)));
switch(k)
{ case 1:


MoveToEx(hdc,70*(i-1)+65,180,0);
LineTo(hdc,70*(i-1)+66,180);
LineTo(hdc,70*(i-1)+66,95);
LineTo(hdc,70*(i-1)+73,95);
LineTo(hdc,70*(i-1)+68,93);
MoveToEx(hdc,70*(i-1)+73,95,0);
LineTo(hdc,70*(i-1)+68,97);
TextOut(hdc,70*(i-1)+75,120,"A->t=B->t",9);
break;
case 2:

//箭头

MoveToEx(hdc,45+70*(i-1),180,0);
LineTo(hdc,40+70*(i-1),182);
MoveToEx(hdc,45+70*(i-1),180,0);
LineTo(hdc,40+70*(i-1),178);
MoveToEx(hdc,45+70*(i-1),180,0);



//箭头

LineTo(hdc,39+70*(i-1),180);
LineTo(hdc,39+70*(i-1),95);
LineTo(hdc,35+70*(i-1),95);

SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255)));
MoveToEx(hdc,39+70*(i-1),95,0);
LineTo(hdc,66+70*(i-1),95);
TextOut(hdc,70*(i-1)+75,135,"B->t=A",6);
break;
case 3:


MoveToEx(hdc,45+70*(i-1),160,0);
LineTo(hdc,43+70*(i-1),160);
LineTo(hdc,43+70*(i-1),75);
LineTo(hdc,37+70*(i-1),75);
LineTo(hdc,42+70*(i-1),77);
MoveToEx(hdc,37+70*(i-1),75,0);
LineTo(hdc,42+70*(i-1),73);
//箭头
TextOut(hdc,70*(i-1)+75,150,"A->h=B",6);
break;
case 4:

MoveToEx(hdc,70*(i-1)+65,160,0);
LineTo(hdc,70*(i-1)+70,158);
MoveToEx(hdc,70*(i-1)+65,160,0);
LineTo(hdc,70*(i-1)+70,162);
MoveToEx(hdc,70*(i-1)+65,160,0);


LineTo(hdc,70*(i-1)+70,160);

LineTo(hdc,70*(i-1)+70,75);
LineTo(hdc,70*(i-1)+75,75);
SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255)));
MoveToEx(hdc,70*(i-1)+70,75,0);
LineTo(hdc,70*(i-1)+42,75);
TextOut(hdc,70*(i-1)+75,165,"A->t->h=A",9);
break;
default:
;
}
j=k+1;

}

void drawupdate(int i,char str[],HDC hdc)
{
char s[3];
int j=1;
_gcvt(i,2,s);
if('0'<=s[1]&&s[1]<='9')
j=2;

TextOut(hdc,70*(i-1)+30,150,"A",1);
TextOut(hdc,70*(i-1)+10,110,"B",1);
Rectangle(hdc,45+70*(i-1),110,70*(i-1)+65,190);
MoveToEx(hdc,45+70*(i-1),150,0);
LineTo(hdc,70*(i-1)+65,150);


TextOut(hdc,47+70*(i-1),115,s,j);
TextOut(hdc,47+70*(i-1),130,str,1);
TextOut(hdc,47+70*(i-1),155,"h",1);
TextOut(hdc,47+70*(i-1),170,"t",1);
}

void draw(int i,char c,HDC hdc)
{
char s[3];
int j=1;
char *str=turnstring(c);
_gcvt(i,2,s);
if('0'<=s[1]&&s[1]<='9')
j=2;
Rectangle(hdc,5+70*(i-1),25,70*(i-1)+35,105);

MoveToEx(hdc,5+70*(i-1),65,0);
LineTo(hdc,35+(i-1)*70,65);



//箭头
MoveToEx(hdc,70*(i-1)+35,95,0);
LineTo(hdc,70*(i-1)+73,95);

LineTo(hdc,70*(i-1)+68,93);
MoveToEx(hdc,70*(i-1)+73,95,0);
LineTo(hdc,70*(i-1)+68,97);

//箭头
MoveToEx(hdc,70*(i-1)+75,75,0);
LineTo(hdc,70*(i-1)+37,75);

LineTo(hdc,70*(i-1)+42,73);
MoveToEx(hdc,70*(i-1)+37,75,0);
LineTo(hdc,70*(i-1)+42,77);


TextOut(hdc,5+70*(i-1)+10,30,s,j);
TextOut(hdc,5+70*(i-1)+10,45,str,1);
TextOut(hdc,5+70*(i-1)+10,70,"h",1);
TextOut(hdc,5+70*(i-1)+10,85,"t",1);
free(str);
}


...全文
362 10 打赏 收藏 转发到动态 举报
写回复
用AI写文章
10 条回复
切换为时间正序
请发表友善的回复…
发表回复
wsphere 2008-09-13
  • 打赏
  • 举报
 回复
楼主的程序有几处地方地方不需要申请内存，并且最后内存也没有释放。但是这不是主要原因，主要原因是在第二次点击菜单的时候，调用node(HWND hwnd)函数在同样的地方创建了两个同样的Edit，造成输入的时候总是在第一个里，所以使用第二次创建的Edit的句柄来GetWindowText()当然什么也没有了。其实我们在node(HWND hwnd)函数中应该先调用DestroyWindow(edit_v);函数来销毁原来的Edit.当然这里也要先判断edit_v是否等于NULL.
zyc_0204 2008-09-13
  • 打赏
  • 举报
 回复
嗯..感谢greatws.非常感谢这么有耐心把代码看完...并提出建议..问题解决了!.
e_sharp 2008-09-13
  • 打赏
  • 举报
 回复
修改了一下，可以完成添加功能，lz可以参考一下

GetWindowText(edit_v,s,3)没问题，主要问题是edit_v多次创建
e_sharp 2008-09-13
  • 打赏
  • 举报
 回复 


void node(HWND hwnd) 

{ 

	HDC hdc=GetDC(hwnd); 



	Node *p; 



	int i=0; 

	if(head!=0) 

	{ 

		deleteNode(head); 

	} 



	Rectangle(hdc,0,20,800,200); 

	//Rectangle(hdc,810,0,1000,200); 

	TextOut(hdc,0,0,"双链表展示:",11); 

	//TextOut(hdc,890,10,"输入字符:",9); 

	//btn_add=CreateWindow("BUTTON","添加",WS_CHILD|WS_VISIBLE,820,20,50,30,hwnd,(HMENU)Node_Btn_add,hInst,NULL); 

	//btn_t=CreateWindow("BUTTON","下一步",WS_CHILD|WS_VISIBLE,820,120,50,30,hwnd,(HMENU)Node_Btn_t,hInst,NULL); 

	//edit_v=CreateWindow("EDIT","",WS_CHILD|WS_VISIBLE|ES_LEFT|WS_BORDER,880,30,100,20,hwnd,(HMENU)Edit_value,hInst,NULL); 

	mainx(); 

	j=5; 

	p=head; 



	while(p->tail!=head) 

	{ 

		p=p->tail; 

		i++; 

		draw(i,p->value,hdc); 

	} 

} 





void get(HWND hwnd) 

{ 

	HDC hdc=GetDC(hwnd); 

	Node *p=malloc(sizeof(Node)); 

	Node *q; 

	int i=0; 

	char *s=malloc(sizeof(char)*3);  //需要free

	RECT r; 

	r.left=0; 

	r.top=20; 

	r.right=800; 

	r.bottom=200; 

	FillRect(hdc,&r,CreateSolidBrush(RGB(255,255,255))); 

	//CreateSolidBrush(RGB( 

	if(j <4) 

	{ 

		MessageBox(hwnd,"演示尚未完","Error",0); 

		free(s);

		return ; 

	} 





	if(0==GetWindowText(edit_v,s,3)) {

		ShowErrMsg();



		MessageBox(hwnd,"失败","查看",0);//出错的地方．．．．．．．．．．第一次单击菜单上的"双链表", 

										//GetWindowText可以得        到值 

										//第二次单击就GetWindowText得不到值.. 



		free(s);



		return;

	}



	SetWindowText(edit_v,"");



	p->value=s[0]; 

	AddNode(head,p);  //添加新节点

	sort(head); //排序



	i=0;

	p = head;

	while(p->tail!=head) //显示

	{ 

		p=p->tail; 

		i++; 

		draw(i,p->value,hdc); 

	} 



	/*

	d=1; 

	d=SearchNode(head,p)-1; 

	if(d>0) 

	{ 

		q=head; 

		while(q->tail!=head) 

		{ 

			q=q->tail; 

			i++; 

			draw(i,q->value,hdc); 

		} 

		j=1; 

		drawupdate(d,s,hdc); 

		AddNode(head,p); 

	} 

	*/



	free(s);

} 



LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam) 

{ 

	switch(message) 

	{ 

	case WM_DESTROY: 

		PostQuitMessage(0); 

		break; 



	case WM_COMMAND: 

		switch(LOWORD(wParam)) 

		{ 

		case 1001: 

			node(hwnd); 

			break; 

		case Node_Btn_add: 

			get(hwnd); 

			break; 

		case Node_Btn_t: 

			drawnext(d,hwnd,j); 

			break; 

		} 

		break; 

	default: 

		return DefWindowProc(hwnd,message,wParam,lParam); 

	} 

	

	return (0); 

}
e_sharp 2008-09-13
  • 打赏
  • 举报
 回复 
#include <windows.h> 



LRESULT CALLBACK  WndProc(HWND,UINT,WPARAM,LPARAM); 



#define Node_Btn_t 104 

#define Node_Btn_h 105 

#define Node_Btn_add 106 

#define Edit_value 107 



HWND btn_add,btn_t,btn_h,edit_v; 

HINSTANCE hInst; 



int j=5; 

int d=0; 

HWND hbt2; 

HMENU hmenu; 

HMENU hsubmenu; 





typedef struct Node{ 

	int location; 

	char value; 

	struct Node * fore; 

	struct Node * tail; 

}Node; 



Node *head=0; //最后不好忘记释放链表



Node * CreateNode() 

{ 

	head=malloc(sizeof(Node)*18); 

	head->fore=head; 

	head->tail=head; 

	return head; 



} 



void AddNode(Node * head,Node * t) 

{ 

	t->tail=head->tail; 

	head->tail=t; 



	t->fore=head; 

	t->tail->fore=t; 

} 



int  SearchNode(Node * head,Node *t) 

{ 

	Node *p;//=malloc(sizeof(Node)); //仅仅是指针操作，不需要分配空间

	int i=0; 

	p=head; 

	while(p->tail!=head) 

	{ 

		p=p->tail; 

		i++; 

		if(p->value >= t->value) 

		{ 

			break; 

		} 

	} 



	return i; 

} 



void sort(Node *head) 

{ 

	Node *p;//=malloc(sizeof(Node)); //仅仅是指针操作，不需要分配空间

	Node *q;//=malloc(sizeof(Node)); 

	p=head; 

	while(p->tail!=head) 

	{ 

		p=p->tail; 

		q=p->tail; 

		while(q!=head) 

		{ 

			if(p->value>q->value) 

			{ 

				char c; 

				c=q->value; 

				q->value=p->value; 

				p->value=c; 

			} 

			q=q->tail; 

		} 

	} 



	q=0; 

	p=0; 



	//free(q); 

	//free(p); 

} 





void mainx() 

{ 

	int i; 

	void deleteNode(); 

	Node *p; 

	if(head==0) 

		head=CreateNode();

	

	srand((unsigned)time(0));  

	for(i=0;i <8;i++) 

	{ 

		p=malloc(sizeof(Node)); 

		p->value=rand()%26+'a'; 

		AddNode(head,p); 

	}  



	sort(head); 



} 



void deleteNode(Node *head) 

{ 

	Node *t=head->tail; 

	Node *s; 

	while(t!=head) 

	{ 

		s=t; 

		t=t->tail; 

		s->tail->fore=s->fore; 

		s->fore->tail=s->tail; 

		free(s); 

	} 

} 



void ShowErrMsg() 

{ 

    TCHAR szBuf[80]; 

    LPVOID lpMsgBuf;

    DWORD dw = GetLastError(); 

	

    FormatMessage(

        FORMAT_MESSAGE_ALLOCATE_BUFFER | 

        FORMAT_MESSAGE_FROM_SYSTEM,

        NULL,

        dw,

        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

        (LPTSTR) &lpMsgBuf,

        0, NULL );

	

	MessageBox(NULL, lpMsgBuf, "系统错误", MB_OK|MB_ICONSTOP); 

	

    LocalFree(lpMsgBuf);

}



int WINAPI WinMain( 

	HINSTANCE hInstance, 

	HINSTANCE PrevInstance, 

	LPSTR lpszCmdLine, 

	int nCmdShow) 

{ 

	MSG Msg; 

	HWND hwnd; 

	WNDCLASS wndclass; 



	hmenu=CreateMenu(); 

	hsubmenu=CreatePopupMenu(); 

	InsertMenu(hsubmenu,1,MF_STRING|MF_BYCOMMAND,1001,"1 双链表建演示"); 

	InsertMenu(hsubmenu,2,MF_STRING|MF_BYCOMMAND,1002,"2 迷宫探索"); 

	InsertMenu(hmenu,3,MF_POPUP,hsubmenu,"游戏选项"); 



	wndclass.cbClsExtra=0; 

	wndclass.cbWndExtra=0; 

	wndclass.hbrBackground=(HBRUSH)GetStockObject(GRAY_BRUSH); 

	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW); 

	wndclass.hIcon=LoadIcon(hInstance,101); 

	wndclass.hInstance=hInstance; 

	wndclass.lpfnWndProc=WndProc; 

	wndclass.lpszClassName="ok"; 

	wndclass.lpszMenuName=0; 

	wndclass.style=0; 



	RegisterClass(&wndclass); 



	hwnd=CreateWindow("ok","菜单",WS_OVERLAPPEDWINDOW,0,0,800,600,0,hmenu,hInstance,0); 



	ShowWindow(hwnd,3); 

	UpdateWindow(hwnd); 

	hInst=hInstance; 



	//放在node(HWND hwnd) 会在同一位置多次创建edit_v

	btn_add=CreateWindow("BUTTON","添加",WS_CHILD|WS_VISIBLE,820,20,50,30,hwnd,(HMENU)Node_Btn_add,hInst,NULL); 

	btn_t=CreateWindow("BUTTON","下一步",WS_CHILD|WS_VISIBLE,820,120,50,30,hwnd,(HMENU)Node_Btn_t,hInst,NULL); 

	edit_v=CreateWindow("EDIT","",WS_CHILD|WS_VISIBLE|ES_LEFT|WS_BORDER,880,30,100,20,hwnd,(HMENU)Edit_value,hInst,NULL);



	while(GetMessage(&Msg,NULL,0,0)) 

	{ 

		TranslateMessage(&Msg); 

		DispatchMessage(&Msg); 

	} 

	return Msg.wParam; 



} 





char * turnstring(char c) 

{ 

	char *s=malloc(sizeof(char)*2); 

	s[0]=c; 

	s[1]='\0'; 

	return s; 

} 



void drawnext(int i,HWND hwnd,int k) 

{ 

	HDC hdc=GetDC(hwnd); 

	SetTextColor(hdc,RGB(255,0,0)); 

	SelectObject(hdc, CreatePen(PS_SOLID,1,RGB(255,0,0))); 



	switch(k) 

	{ 

	case 1: 

		MoveToEx(hdc,70*(i-1)+65,180,0); 

		LineTo(hdc,70*(i-1)+66,180); 

		LineTo(hdc,70*(i-1)+66,95); 

		LineTo(hdc,70*(i-1)+73,95); 

		LineTo(hdc,70*(i-1)+68,93); 

		MoveToEx(hdc,70*(i-1)+73,95,0); 

		LineTo(hdc,70*(i-1)+68,97); 

		TextOut(hdc,70*(i-1)+75,120,"A->t=B->t",9); 

		break; 



	case 2: 

		//箭头 

		MoveToEx(hdc,45+70*(i-1),180,0); 

		LineTo(hdc,40+70*(i-1),182); 

		MoveToEx(hdc,45+70*(i-1),180,0); 

		LineTo(hdc,40+70*(i-1),178); 

		MoveToEx(hdc,45+70*(i-1),180,0); 



		//箭头 

		LineTo(hdc,39+70*(i-1),180); 

		LineTo(hdc,39+70*(i-1),95); 

		LineTo(hdc,35+70*(i-1),95); 



		SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255))); 

		MoveToEx(hdc,39+70*(i-1),95,0); 

		LineTo(hdc,66+70*(i-1),95); 

		TextOut(hdc,70*(i-1)+75,135,"B->t=A",6); 

		break; 



	case 3: 

		MoveToEx(hdc,45+70*(i-1),160,0); 

		LineTo(hdc,43+70*(i-1),160); 

		LineTo(hdc,43+70*(i-1),75); 

		LineTo(hdc,37+70*(i-1),75); 

		LineTo(hdc,42+70*(i-1),77); 

		MoveToEx(hdc,37+70*(i-1),75,0); 

		LineTo(hdc,42+70*(i-1),73); 

		//箭头 

		TextOut(hdc,70*(i-1)+75,150,"A->h=B",6); 

		break; 



	case 4: 

		MoveToEx(hdc,70*(i-1)+65,160,0); 

		LineTo(hdc,70*(i-1)+70,158); 

		MoveToEx(hdc,70*(i-1)+65,160,0); 

		LineTo(hdc,70*(i-1)+70,162); 

		MoveToEx(hdc,70*(i-1)+65,160,0); 

		

		LineTo(hdc,70*(i-1)+70,160); 



		LineTo(hdc,70*(i-1)+70,75); 

		LineTo(hdc,70*(i-1)+75,75); 

		SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255))); 

		MoveToEx(hdc,70*(i-1)+70,75,0); 

		LineTo(hdc,70*(i-1)+42,75); 

		TextOut(hdc,70*(i-1)+75,165,"A->t->h=A",9); 

		break; 



	default: 

		break;

	} 

	

	j=k+1; 



} 



void drawupdate(int i,char str[],HDC hdc) 

{ 

	char s[3]; 

	int j=1; 

	_gcvt(i,2,s); 

	if('0' <=s[1]&&s[1] <='9') 

		j=2; 



	TextOut(hdc,70*(i-1)+30,150,"A",1); 

	TextOut(hdc,70*(i-1)+10,110,"B",1); 

	Rectangle(hdc,45+70*(i-1),110,70*(i-1)+65,190); 

	MoveToEx(hdc,45+70*(i-1),150,0); 

	LineTo(hdc,70*(i-1)+65,150); 





	TextOut(hdc,47+70*(i-1),115,s,j); 

	TextOut(hdc,47+70*(i-1),130,str,1); 

	TextOut(hdc,47+70*(i-1),155,"h",1); 

	TextOut(hdc,47+70*(i-1),170,"t",1); 

	

} 



void draw(int i,char c,HDC hdc) 

{ 

	char s[3]; 

	int j=1; 

	char *str=turnstring(c); 

	_gcvt(i,2,s); 

	if('0' <=s[1]&&s[1] <='9') 

	j=2; 

	Rectangle(hdc,5+70*(i-1),25,70*(i-1)+35,105); 



	MoveToEx(hdc,5+70*(i-1),65,0); 

	LineTo(hdc,35+(i-1)*70,65); 





	//箭头 

	MoveToEx(hdc,70*(i-1)+35,95,0); 

	LineTo(hdc,70*(i-1)+73,95); 



	LineTo(hdc,70*(i-1)+68,93); 

	MoveToEx(hdc,70*(i-1)+73,95,0); 

	LineTo(hdc,70*(i-1)+68,97); 



	//箭头 

	MoveToEx(hdc,70*(i-1)+75,75,0); 

	LineTo(hdc,70*(i-1)+37,75); 



	LineTo(hdc,70*(i-1)+42,73); 

	MoveToEx(hdc,70*(i-1)+37,75,0); 

	LineTo(hdc,70*(i-1)+42,77); 





	TextOut(hdc,5+70*(i-1)+10,30,s,j); 

	TextOut(hdc,5+70*(i-1)+10,45,str,1); 

	TextOut(hdc,5+70*(i-1)+10,70,"h",1); 

	TextOut(hdc,5+70*(i-1)+10,85,"t",1); 

	free(str);  

}
e_sharp 2008-09-13
  • 打赏
  • 举报
 回复
修改了一下，可以完成添加功能，lz可以参考一下

[code=C/C++]#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

#define Node_Btn_t 104
#define Node_Btn_h 105
#define Node_Btn_add 106
#define Edit_value 107

HWND btn_add,btn_t,btn_h,edit_v;
HINSTANCE hInst;

int j=5;
int d=0;
HWND hbt2;
HMENU hmenu;
HMENU hsubmenu;


typedef struct Node{
int location;
char value;
struct Node * fore;
struct Node * tail;
}Node;

Node *head=0; //最后不好忘记释放链表

Node * CreateNode()
{
head=malloc(sizeof(Node)*18);
head->fore=head;
head->tail=head;
return head;

}

void AddNode(Node * head,Node * t)
{
t->tail=head->tail;
head->tail=t;

t->fore=head;
t->tail->fore=t;
}

int SearchNode(Node * head,Node *t)
{
Node *p;//=malloc(sizeof(Node)); //仅仅是指针操作，不需要分配空间
int i=0;
p=head;
while(p->tail!=head)
{
p=p->tail;
i++;
if(p->value >= t->value)
{
break;
}
}

return i;
}

void sort(Node *head)
{
Node *p;//=malloc(sizeof(Node)); //仅仅是指针操作，不需要分配空间
Node *q;//=malloc(sizeof(Node));
p=head;
while(p->tail!=head)
{
p=p->tail;
q=p->tail;
while(q!=head)
{
if(p->value>q->value)
{
char c;
c=q->value;
q->value=p->value;
p->value=c;
}
q=q->tail;
}
}

q=0;
p=0;

//free(q);
//free(p);
}


void mainx()
{
int i;
void deleteNode();
Node *p;
if(head==0)
head=CreateNode();

srand((unsigned)time(0));
for(i=0;i <8;i++)
{
p=malloc(sizeof(Node));
p->value=rand()%26+'a';
AddNode(head,p);
}

sort(head);

}

void deleteNode(Node *head)
{
Node *t=head->tail;
Node *s;
while(t!=head)
{
s=t;
t=t->tail;
s->tail->fore=s->fore;
s->fore->tail=s->tail;
free(s);
}
}

void ShowErrMsg()
{
TCHAR szBuf[80];
LPVOID lpMsgBuf;
DWORD dw = GetLastError();

FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
dw,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0, NULL );

MessageBox(NULL, lpMsgBuf, "系统错误", MB_OK|MB_ICONSTOP);

LocalFree(lpMsgBuf);
}

int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE PrevInstance,
LPSTR lpszCmdLine,
int nCmdShow)
{
MSG Msg;
HWND hwnd;
WNDCLASS wndclass;

hmenu=CreateMenu();
hsubmenu=CreatePopupMenu();
InsertMenu(hsubmenu,1,MF_STRING|MF_BYCOMMAND,1001,"1 双链表建演示");
InsertMenu(hsubmenu,2,MF_STRING|MF_BYCOMMAND,1002,"2 迷宫探索");
InsertMenu(hmenu,3,MF_POPUP,hsubmenu,"游戏选项");

wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)GetStockObject(GRAY_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(hInstance,101);
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName="ok";
wndclass.lpszMenuName=0;
wndclass.style=0;

RegisterClass(&wndclass);

hwnd=CreateWindow("ok","菜单",WS_OVERLAPPEDWINDOW,0,0,800,600,0,hmenu,hInstance,0);

ShowWindow(hwnd,3);
UpdateWindow(hwnd);
hInst=hInstance;

//放在node(HWND hwnd) 会在同一位置多次创建edit_v
btn_add=CreateWindow("BUTTON","添加",WS_CHILD|WS_VISIBLE,820,20,50,30,hwnd,(HMENU)Node_Btn_add,hInst,NULL);
btn_t=CreateWindow("BUTTON","下一步",WS_CHILD|WS_VISIBLE,820,120,50,30,hwnd,(HMENU)Node_Btn_t,hInst,NULL);
edit_v=CreateWindow("EDIT","",WS_CHILD|WS_VISIBLE|ES_LEFT|WS_BORDER,880,30,100,20,hwnd,(HMENU)Edit_value,hInst,NULL);

while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;

}


char * turnstring(char c)
{
char *s=malloc(sizeof(char)*2);
s[0]=c;
s[1]='\0';
return s;
}

void drawnext(int i,HWND hwnd,int k)
{
HDC hdc=GetDC(hwnd);
SetTextColor(hdc,RGB(255,0,0));
SelectObject(hdc, CreatePen(PS_SOLID,1,RGB(255,0,0)));

switch(k)
{
case 1:
MoveToEx(hdc,70*(i-1)+65,180,0);
LineTo(hdc,70*(i-1)+66,180);
LineTo(hdc,70*(i-1)+66,95);
LineTo(hdc,70*(i-1)+73,95);
LineTo(hdc,70*(i-1)+68,93);
MoveToEx(hdc,70*(i-1)+73,95,0);
LineTo(hdc,70*(i-1)+68,97);
TextOut(hdc,70*(i-1)+75,120,"A->t=B->t",9);
break;

case 2:
//箭头
MoveToEx(hdc,45+70*(i-1),180,0);
LineTo(hdc,40+70*(i-1),182);
MoveToEx(hdc,45+70*(i-1),180,0);
LineTo(hdc,40+70*(i-1),178);
MoveToEx(hdc,45+70*(i-1),180,0);

//箭头
LineTo(hdc,39+70*(i-1),180);
LineTo(hdc,39+70*(i-1),95);
LineTo(hdc,35+70*(i-1),95);

SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255)));
MoveToEx(hdc,39+70*(i-1),95,0);
LineTo(hdc,66+70*(i-1),95);
TextOut(hdc,70*(i-1)+75,135,"B->t=A",6);
break;

case 3:
MoveToEx(hdc,45+70*(i-1),160,0);
LineTo(hdc,43+70*(i-1),160);
LineTo(hdc,43+70*(i-1),75);
LineTo(hdc,37+70*(i-1),75);
LineTo(hdc,42+70*(i-1),77);
MoveToEx(hdc,37+70*(i-1),75,0);
LineTo(hdc,42+70*(i-1),73);
//箭头
TextOut(hdc,70*(i-1)+75,150,"A->h=B",6);
break;

case 4:
MoveToEx(hdc,70*(i-1)+65,160,0);
LineTo(hdc,70*(i-1)+70,158);
MoveToEx(hdc,70*(i-1)+65,160,0);
LineTo(hdc,70*(i-1)+70,162);
MoveToEx(hdc,70*(i-1)+65,160,0);

LineTo(hdc,70*(i-1)+70,160);

LineTo(hdc,70*(i-1)+70,75);
LineTo(hdc,70*(i-1)+75,75);
SelectObject(hdc,CreatePen(PS_SOLID,1,RGB(255,255,255)));
MoveToEx(hdc,70*(i-1)+70,75,0);
LineTo(hdc,70*(i-1)+42,75);
TextOut(hdc,70*(i-1)+75,165,"A->t->h=A",9);
break;

default:
break;
}

j=k+1;

}

void drawupdate(int i,char str[],HDC hdc)
{
char s[3];
int j=1;
_gcvt(i,2,s);
if('0' <=s[1]&&s[1] <='9')
j=2;

TextOut(hdc,70*(i-1)+30,150,"A",1);
TextOut(hdc,70*(i-1)+10,110,"B",1);
Rectangle(hdc,45+70*(i-1),110,70*(i-1)+65,190);
MoveToEx(hdc,45+70*(i-1),150,0);
LineTo(hdc,70*(i-1)+65,150);


TextOut(hdc,47+70*(i-1),115,s,j);
TextOut(hdc,47+70*(i-1),130,str,1);
TextOut(hdc,47+70*(i-1),155,"h",1);
TextOut(hdc,47+70*(i-1),170,"t",1);

}

code]
greatws 2008-09-13
  • 打赏
  • 举报
 回复
看了下问题不少
Node *p=malloc(sizeof(Node));
malloc返回是一个void*指针，要转换为Node*指针，需要注意这点
Node *p=(Node*)malloc(sizeof(Node));

初始化句柄和指针之类的要置NULL，还有，不要用0代替NULL。
每次点击菜单，你都在相同位置创建按钮，导致第二次点击不知道是哪个，所以不显示



HWND btn_add = NULL, btn_t = NULL ,btn_h = NULL, edit_v = NULL; 

HINSTANCE hInst = NULL;

 



//第二次时候判断下，就不用再创建了

	if(btn_add == NULL)  //判断是否第一次点

	{

		Rectangle(hdc,0,20,800,200); 

		Rectangle(hdc,810,0,1000,200); 

		TextOut(hdc,0,0,"双链表展示:",11); 

		TextOut(hdc,890,10,"输入字符:",9); 

		btn_add=CreateWindow("BUTTON","添加",WS_CHILD|WS_VISIBLE,820,20,50,30,hwnd,(HMENU)Node_Btn_add,hInst,NULL); 

		btn_t=CreateWindow("BUTTON","下一步",WS_CHILD|WS_VISIBLE,820,120,50,30,hwnd,(HMENU)Node_Btn_t,hInst,NULL); 

		edit_v=CreateWindow("EDIT","",WS_CHILD|WS_VISIBLE|ES_LEFT|WS_BORDER,880,30,100,20,hwnd,(HMENU)Edit_value,hInst,NULL); 

	}




这里还有问题


void draw(int i,char c,HDC hdc) 

{ 

	char s[100]; //3不够，要越界，我没仔细计算需要多少，写了多了一点，你可以看下实际需要多少

	int j=1; 

	char *str=turnstring(c); 

	_gcvt(i,2,s); 

	if('0' <=s[1]&&s[1] <='9') 

		j=2; 

//...

}



void drawupdate(int i,char str[],HDC hdc) 

{ 

	char s[100]; ///////////////////同上

	int j=1; 

	_gcvt(i,2,s); 

//...

}





Node * CreateNode() 

{ 

	head=(Node*)malloc(sizeof(Node)/*  *18   */);   //分配这个干嘛？

	head->fore=head; 

	head->tail=head; 

	return head; 



} 



void mainx() 

{ 

	int i; 

	//void deleteNode(); //这又是什么意思？？

	Node *p; 

///。。。

}






这里没必要分配和释放


void sort(Node *head) 

{ 

	Node *p = NULL;//=(Node*)malloc(sizeof(Node)); 

	Node *q = NULL;//=(Node*)malloc(sizeof(Node)); 

	p=head; 

	while(p->tail!=head) 

	{ 

		p=p->tail; 

		q=p->tail; 

		while(q!=head) 

		{ 

			if(p->value>q->value) 

			{ 

				char c; 

				c=q->value; 

				q->value=p->value; 

				p->value=c; 

			} 

			q=q->tail; 

		} 



	} 

	//q=0; 

	//p=0; 

	//free(q); 

	//free(p); 

}
sjdev 2008-09-13
  • 打赏
  • 举报
 回复
还不如你把代码发过来，我帮你调。反正现在没事。
jameshooo 2008-09-13
  • 打赏
  • 举报
 回复
用InternalGetWindowText试试
zyc_0204 2008-09-13
  • 打赏
  • 举报
 回复

void node(HWND hwnd)
{

HDC hdc=GetDC(hwnd);

Node *p;

int i=0;
if(head!=0)
{
deleteNode(head);

}
Rectangle(hdc,0,20,800,200);
Rectangle(hdc,810,0,1000,200);
TextOut(hdc,0,0,"双链表展示:",11);
TextOut(hdc,890,10,"输入字符:",9);
btn_add=CreateWindow("BUTTON","添加",WS_CHILD|WS_VISIBLE,820,20,50,30,hwnd,(HMENU)Node_Btn_add,hInst,NULL);
btn_t=CreateWindow("BUTTON","下一步",WS_CHILD|WS_VISIBLE,820,120,50,30,hwnd,(HMENU)Node_Btn_t,hInst,NULL);
edit_v=CreateWindow("EDIT","",WS_CHILD|WS_VISIBLE|ES_LEFT|WS_BORDER,880,30,100,20,hwnd,(HMENU)Edit_value,hInst,NULL);
mainx();
j=5;
p=head;
while(p->tail!=head)
{
p=p->tail;
i++;
draw(i,p->value,hdc);
}
}


void get(HWND hwnd)
{

HDC hdc=GetDC(hwnd);
Node *p=malloc(sizeof(Node));
Node *q;
int i=0;
char *s=malloc(sizeof(char)*3);
RECT r;
r.left=0;
r.top=20;
r.right=800;
r.bottom=200;
FillRect(hdc,&r,CreateSolidBrush(RGB(255,255,255)));
//CreateSolidBrush(RGB(
if(j<4)
{
MessageBox(hwnd,"演示尚未完","Error",0);
return ;
}


if(0==GetWindowText(edit_v,s,3))

MessageBox(hwnd,"失败","查看",0);//出错的地方．．．．．．．．．．第一次单击菜单上的"双链表",
//GetWindowText可以得 到值
//第二次单击就GetWindowText得不到值..
p->value=s[0];
sort(head);
d=1;
d=SearchNode(head,p)-1;
if(d>0)
{
q=head;
while(q->tail!=head)
{
q=q->tail;
i++;
draw(i,q->value,hdc);
}
j=1;
drawupdate(d,s,hdc);
AddNode(head,p);
}

// }
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{


switch(message)
{

case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{ case 1001:
node(hwnd);
break;
case Node_Btn_add:
get(hwnd);
break;
case Node_Btn_t:
drawnext(d,hwnd,j);
break;


}
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return (0);
}
C#通过WIN32API获取外部程序sysListview的值和TreeView的值.pdf
C#通过WIN32API获取外部程序sysListview的值和TreeView的值.pdf
labview获取窗口标题Getwindowtext.vi
使用Labview2013中文版编辑，通过调用API中user32.dll的GetWindowTextA函数实现用句柄获取窗口标题，函数参数如下： int32_t GetWindowTextA(int32_t Hwnd, CStr lpString, int32_t cch);
易语言api窗口函数的具体应用
易语言api窗口函数的具体应用源码,WindowFromPoint,FindWindow,FindWindowEx,newparnet,GetParent,SetWindowPos,movewindow,SetCaretPos,getclassname,getwindowtext
易语言QQ注册软件
易语言QQ注册软件源码,QQ注册软件,验证,找QQ号码,API_FindWindowEx,API_GetWindowText
易语言Demo源码,易语言热键编辑框模块
易语言热键编辑框模块源码,热键编辑框模块,模块_卸载所有热键框,模块_卸载指定热键框,模块_注册热键框,热键框消息处理,解析按键,模块_取功能键,模块_取键,API_SetWindowLong,API_CallWindowProc,API_GetWindowText,API_EnableWindow,API_PostMessage,API_GetK
C语言

69,373

社区成员

243,079

社区内容

发帖
与我相关
我的任务
社区描述
C语言相关问题讨论
社区管理员
  • C语言
  • 花神庙码农
  • 架构师李肯
加入社区
  • 近7日
  • 近30日
  • 至今

加载中

查看更多榜单
社区公告
暂无公告

试试用AI创作助手写篇文章吧

+ 用AI写文章