加载图片并显示。。。窗口一片空白。。。
图片已加载显示，超过256色，没法编辑。不过程序应该照样可以显示，这应该不是问题。。
是不是图片的宽度高度什么的没设置对？？
急。。
大家帮忙哦。。。先谢谢了。。
#include <windows.h>
#include <wingdi.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HelloWin") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("The Hello Program"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL) ; // creation parameters
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdcMem, hdc ;
PAINTSTRUCT ps ;
HBITMAP bitmap,IDB_BITMAP1;//定义bitmap对象
BITMAP bmp;
HINSTANCE hInst,hInstance;
switch (message)
{
case WM_CREATE:
InvalidateRect(hwnd,NULL,TRUE);
return 0 ;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
hdcMem=CreateCompatibleDC(NULL);
bitmap=LoadBitmap( hInstance,MAKEINTRESOURCE(IDB_BITMAP1));
GetObject(bitmap,sizeof(bmp),&bmp);//获得bitmap信息到bmp结构中;
SelectObject(hdcMem,bitmap);//将BMP选入到内存DC中
DeleteObject(bitmap);//删除对象
//StretchBlt(hdc,0,0,500/4,500/4,hdcMem,0,0,500/4,500/4,WHITENESS );
BitBlt(hdc,0,0,500/4,500/4,hdcMem,0,0,SRCINVERT);//将内存DC中的内容拷贝到当前窗口DC中,并显示
DeleteDC(hdcMem);//删除DC；
EndPaint(hwnd,&ps);
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
[解决办法]
修改后的代码，本地跑ok的。
需要添加一个叫IDB_BITMAP1的资源。
#include <windows.h>#include <wingdi.h>#include "resource.h"LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){ static TCHAR szAppName[] = TEXT ("HelloWin") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, // window class name TEXT ("The Hello Program"), // window caption WS_OVERLAPPEDWINDOW, // window style CW_USEDEFAULT, // initial x position CW_USEDEFAULT, // initial y position CW_USEDEFAULT, // initial x size CW_USEDEFAULT, // initial y size NULL, // parent window handle NULL, // window menu handle hInstance, // program instance handle NULL) ; // creation parameters ShowWindow (hwnd, iCmdShow) ; UpdateWindow (hwnd) ; while (GetMessage (&msg, NULL, 0, 0)) { TranslateMessage (&msg) ; DispatchMessage (&msg) ; } return msg.wParam ;}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){ HDC hdcMem, hdc ; PAINTSTRUCT ps ; HBITMAP bitmap;//定义bitmap对象 BITMAP bmp; HINSTANCE hInst,hInstance; switch (message) { case WM_CREATE: InvalidateRect(hwnd,NULL,TRUE); return 0 ; case WM_PAINT: hdc=BeginPaint(hwnd,&ps); hdcMem=CreateCompatibleDC(hdc); bitmap=LoadBitmap( (HINSTANCE)GetModuleHandle(NULL),MAKEINTRESOURCE(IDB_BITMAP1)); GetObject(bitmap,sizeof(bmp),&bmp);//获得bitmap信息到bmp结构中; SelectObject(hdcMem,bitmap);//将BMP选入到内存DC中 //StretchBlt(hdc,0,0,500/4,500/4,hdcMem,0,0,500/4,500/4,WHITENESS ); BitBlt(hdc,0,0,500/4,500/4,hdcMem,0,0,SRCCOPY);//将内存DC中的内容拷贝到当前窗口DC中,并显示 DeleteObject(bitmap);//删除对象 DeleteDC(hdcMem);//删除DC； EndPaint(hwnd,&ps); return 0 ; case WM_DESTROY: PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, message, wParam, lParam) ;}