跪求!怎样用c++ 截屏?

怎样用sdk截屏,并保存为位图文件?

你可以用键盘键模拟截屏。
这个是全屏：
void snapscreen_2_clipboard()
{
keybd_event(VK_SNAPSHOT,0x2C,0,0);
keybd_event(VK_SNAPSHOT,0x2C,KEYEVENTF_KEYUP,0);
}
这个是工作窗（Alt-PrintScreen）：
void snapwin_2_clipboard()
{
keybd_event(VK_LMENU,0xA4,0,0);
keybd_event(VK_SNAPSHOT,0x2C,0,0);
keybd_event(VK_SNAPSHOT,0x2C,KEYEVENTF_KEYUP,0);
keybd_event(VK_LMENU,0xA4,KEYEVENTF_KEYUP,0);
}
保存为BMP 全程序（用的是C,你可以很容易地改C++):

#include <Windows.h>
#include <Winuser.h>
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include <time.h>
#define DEBUG 1
#pragma comment (lib, "User32.lib")
#pragma comment (lib, "Gdi32.lib")

void snapscreen_2_clipboard();
void snapwin_2_clipboard();
void wait ( int m_seconds);
// dib functions
int GetBytesPerPixel(int depth);
int GetBytesPerRow(int width, int depth);
int GetBitmapBytes(int width, int height, int depth);
void save_clipboard_img_to_bmp();

FILE *fout;
main(int argc, char * argv[])
{
int i=0,j=0;
int px,py;
time_t now;
unsigned char action;
char buf[256];

// following 3 calls for screen capture and save to bmp
(void) snapscreen_2_clipboard();
(void) wait(1000);
(void) save_clipboard_img_to_bmp();
exit(0);
}

void wait ( int m_seconds )
{
clock_t endwait;
endwait = clock () + m_seconds ; // * CLK_TCK
while (clock() < endwait) {}
}

void snapwin_2_clipboard()
{
keybd_event(VK_LMENU,0xA4,0,0);
keybd_event(VK_SNAPSHOT,0x2C,0,0);
keybd_event(VK_SNAPSHOT,0x2C,KEYEVENTF_KEYUP,0);
keybd_event(VK_LMENU,0xA4,KEYEVENTF_KEYUP,0);
}

void snapscreen_2_clipboard()
{
keybd_event(VK_SNAPSHOT,0x2C,0,0);
keybd_event(VK_SNAPSHOT,0x2C,KEYEVENTF_KEYUP,0);
}

int GetBytesPerPixel(int depth)
{ return (depth==32 ? 4 : 3);
}
int GetBytesPerRow(int width, int depth)
{
int bytesPerPixel = GetBytesPerPixel(depth);
int bytesPerRow = ((width * bytesPerPixel + 3) & ~3);
return bytesPerRow;
}
// bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight, bmi.bmiHeader.biBitCount
int GetBitmapBytes(int width, int height, int depth)
{
return height * GetBytesPerRow(width, depth);
}
void save_clipboard_img_to_bmp()
{
char nameout[80];
HANDLE h_bitmap,h_dib;
BITMAPINFO bmi;
HDC hDC;
int imageBytes;
BITMAPFILEHEADER hdr;
int scanLineCount;
unsigned char *img;
if (!OpenClipboard(NULL)) {
printf("Can not open clipboard\n");
exit(0);
};
if (DEBUG ==1) printf("pass open clipboard\n");
// HANDLE GetClipboardData(UINT uFormat);
h_bitmap = GetClipboardData(CF_BITMAP);
h_dib = GetClipboardData(CF_DIB);
if (h_bitmap ==NULL || h_dib ==NULL){
printf("I got NULL bitmap: ");
} else { printf("I got bitmap: ");};
memcpy(&bmi,h_dib,sizeof(bmi));
printf("%d x %d \n",bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight);
hDC = CreateCompatibleDC(NULL); // Gdi32.lib.
CloseClipboard();
bmi.bmiHeader.biCompression = BI_RGB;
// possible to use part of imgage with img_w,img_h
imageBytes = GetBitmapBytes(bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight,
bmi.bmiHeader.biBitCount);
printf("pass GetBitmapBytes=%d \n",imageBytes);
img = (char *) malloc(imageBytes);
if (!img) {
printf("No enought memory for img !\n"); exit(0);
}
// BITMAPFILEHEADER hdr;
hdr.bfType = ((WORD) ('M' << 8) | 'B'); // is always "BM"
hdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)
+ (bmi.bmiHeader.biClrUsed * sizeof(RGBQUAD)) + bmi.bmiHeader.biSizeImage;
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
hdr.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)
+ (bmi.bmiHeader.biClrUsed * sizeof(RGBQUAD));
scanLineCount = GetDIBits(hDC,h_bitmap,0,bmi.bmiHeader.biHeight, img, &bmi,
DIB_RGB_COLORS);
strcpy(nameout,"keyb_tmp.bmp");
if ( (fout = fopen(nameout,"wb") ) == NULL ) {
printf("\007Cann't open output file: %s ", nameout);exit(1);
};
fwrite( &hdr, sizeof(BITMAPFILEHEADER ), 1, fout );
fwrite( &bmi, sizeof(BITMAPINFO), 1, fout );
fwrite( img, sizeof(unsigned char),imageBytes, fout );
fclose(fout);
printf("Output in %s\n",nameout);
}


此程序可能含一些你不需要的部分。可以自己删改。MS VC++ 6.0 程序。

alt加print

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