Question

vc插入bmp图片的问题...

case WM_PAINT:
hdcClient = BeginPaint (hwnd, &ps) ;
hdcWindow = LoadImage(NULL, szFilename, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
StretchBlt (hdcClient, 0, 0, 500, 500, hdcWindow, 0, 0, 400, 400, SRCCOPY) ;
ReleaseDC (hwnd, hdcWindow) ;
EndPaint (hwnd, &ps) ;
return 0 ;

大侠赐教啊...为啥木有显示图片啊啊 ...

Answer 1

HDC hdcClient,hmemdc;
HBITMAP hbitmap;
case WM_PAINT:
hdcClient = BeginPaint (hwnd, &ps) ;
hmemdc=CreateCompatibleDC(hdcClient);//创建与hdcClient兼容的内存DC
//只有内存DC可以选入位图
//初始内存DC只有1像素大小，选入位图后才拓展其显示平面
//选入的位图只能是单色位图或者颜色尺寸与hmemdc相同的位图，如都是24位或者都是32位等
hbitmap= (HBITMAP)LoadImage(NULL, szFilename, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
SelectObject(hmemdc,hbitmap);//将位图选入内存DC

StretchBlt (hdcClient, 0, 0, 500, 500, hmemdc, 0, 0, 400, 400, SRCCOPY) ;//将内存DC的位图复制到hdcClient上
DeleteObject(hbitmap);//删除
DeleteDC(hmemdc);//记得删除对象
EndPaint (hwnd, &ps) ;
return 0 ;

以上凭记忆书写，若有语法错误，自行修改。

Answer 2

hMainDC = BeginPaint(hWnd, &MainPaint);
dcMem = CreateCompatibleDC(hMainDC);
pOldBitmap = (HBITMAP)SelectObject(dcMem, hBKGND);
nError = StretchBlt (hMainDC, 0, 0,
g_uiWndWidth, g_uiWndHeight,
dcMem, 0, 0,
g_uiWndWidth, g_uiWndHeight,
picKey);
SelectObject(dcMem, pOldBitmap);
DeleteObject(hBKGND);
DeleteDC(dcMem);
EndPaint(hWnd, &MainPaint);

你按这个代码改一下，很久以前写的。
还有，用LoadBitmap加载位图，而且别写在WM_PAINT消息内。

Answer 3

hdcWindow应该是窗口DC句柄
LoadImage返回的是位图资源句柄。

Answer 4

{
typedef int (WINAPI ICEPUB_DISPIMG)(HWND hWnd,char *strImgFilename,int x,int y);
ICEPUB_DISPIMG *icePub_dispImg = 0;
HINSTANCE hDLLDrv = LoadLibrary("icePubDll.dll");
if(hDLLDrv)
{
icePub_dispImg = (ICEPUB_DISPIMG *)GetProcAddress(hDLLDrv, "icePub_dispImg");
}

if(icePub_dispImg != NULL)
icePub_dispImg(m_hWnd,"b.png",10,10);
// icePub_dispImg(m_ctrlText.m_hWnd,"b.jpg",0,0);
if(hDLLDrv)
FreeLibrary(hDLLDrv);
}