#include <stdio.h>
#include <stdlib.h>
#include <tchar.h>
#include <windows.h>
#define WHSIZE 32
int _tmain(int, char**)
{
BITMAPINFOHEADER bih = {0}; //生成位图信息头
bih.biSize = sizeof(bih);
bih.biBitCount = 24;
bih.biWidth = bih.biHeight = WHSIZE;
bih.biPlanes = 1;
bih.biSizeImage = bih.biWidth * 3 * bih.biHeight;
void* lpBits = NULL;
HBITMAP hBitmap = CreateDIBSection(NULL, (BITMAPINFO*)&bih, DIB_RGB_COLORS, &lpBits, NULL, 0);
if (hBitmap != NULL)
{ //用CreateDIBSection创建HBITMAP
for (int i = 0; i < bih.biHeight; i++) //生成一个渐变位图
memset(((char*)lpBits) + i * bih.biWidth * 3, 0xFF * i / (bih.biHeight - 1), bih.biWidth * 3);
BITMAPFILEHEADER bfh = {0}; //生成文件头
bfh.bfType = 'MB';
bfh.bfOffBits = sizeof(bfh) + sizeof(bih);
bfh.bfSize = bfh.bfOffBits + bih.biSizeImage;
{ //写文件
HANDLE hFile = CreateFile(_T("E:\\a.bmp"), GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, NULL);
if (hFile)
{
DWORD dwUseless = 0;
WriteFile(hFile, &bfh, sizeof(bfh), &dwUseless, NULL);
WriteFile(hFile, &bih, sizeof(bih), &dwUseless, NULL);
WriteFile(hFile, lpBits, bih.biSizeImage, &dwUseless, NULL);
CloseHandle(hFile);
printf("%s", "Write a.bmp succeeded!\r\n");
}
}
HBITMAP hBitmap2 = (HBITMAP)OleDuplicateData(hBitmap, CF_BITMAP, 0); //用下面的CopyImage就没问题，或者源是LoadImage出来的也没问题
//HBITMAP hBitmap2 = (HBITMAP)CopyImage(hBitmap, IMAGE_BITMAP, 0, 0, 0);
if (hBitmap2)
{
HDC hdc = GetDC(NULL);
if (hdc != NULL)
{
char chBits[WHSIZE * 3 * WHSIZE];
if (GetDIBits(hdc, hBitmap2, 0, bih.biHeight, chBits, (BITMAPINFO*)&bih, DIB_RGB_COLORS) != 0)
{
HANDLE hFile = CreateFile(_T("E:\\b.bmp"), GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, 0, NULL);
if (hFile)
{
DWORD dwUseless = 0;
WriteFile(hFile, &bfh, sizeof(bfh), &dwUseless, NULL);
WriteFile(hFile, &bih, sizeof(bih), &dwUseless, NULL);
WriteFile(hFile, chBits, bih.biSizeImage, &dwUseless, NULL);
CloseHandle(hFile);
printf("%s", "Write b.bmp succeeded!\r\n");
}
}
ReleaseDC(NULL, hdc);
}
DeleteObject(hBitmap2);
}
DeleteObject(hBitmap);
}
system("PAUSE");
return 0;
}
用CreateDIBSection创建的HBITMAP进行OleDuplicateData复制出来的HBITMAP有问题，在一些地方会显示黑屏，一些地方直接返回失败。于是写了上面这段代码作测试，结果就是GetDIBits返回0，取不到像素数据。
如果把OleDuplicateData换成CopyImage则执行成功，两个BMP都可以保存，或者如果源HBITMAP是LoadImage创建的，OleDuplicateData出来的HBITMAP也可以正常访问。
这是BUG，还是本来就不能这么搞？
