c - Pascal 到 C 的翻译

Question

这个问题已经有答案了:

C: take screenshot (2 个回答)

已关闭 9 年前。

我有一个用 pascal 拍摄屏幕的程序:

uses Graphics, 
     LCLIntf, 
     LCLType;

var  
     Screen:   TBitmap;
     ScreenDC: HDC;
begin
     Screen    := TBitmap.Create;
     ScreenDC  := GetDC(0);
     Screen.LoadFromDevice(ScreenDC);
     ReleaseDC(0, ScreenDC);
     Screen.SaveToFile("Screen.bmp");
end.

我的问题在于LoadFromDevice() ，和SaveToFile()功能。可以使用哪些函数(如果有)在 C 编程语言中实现这些功能。尝试尽可能远离第三方库。 (WinAPI)

Answer 1

看看这个

HDC hDC = GetDC(g_hWnd); 
LPRECT rect = (LPRECT)malloc(sizeof(RECT)); 
GetWindowRect(g_hWnd,rect); 
int h = rect->right - rect->left;
int w = rect->bottom - rect->top; 
LPRECT rect = (LPRECT)malloc(sizeof(RECT)); 

GetWindowRect(g_hWnd,rect); 
HBITMAP hBmp = CreateCompatibleBitmap(hDC,w,h); 
PBITMAPINFO pbmi;
pbmi = CreateBitmapInfoStruct(g_hWnd,hBmp); 

CreateBMPFile(g_hWnd, TEXT("c:\\TEMPO\\TestG2.bmp"), pbmi, hBmp, hDC) ;
ReleaseDC(g_hWnd,hDC); 
DeleteObject(hBmp); 
DeleteObject(pbmi); 

if (rect != nullptr)
    free(rect);