用VC弄了个关于截屏的Dll程序，但是在WR中运行时总是跑不通，希望高手指点，具体代码如下:
// CutScreenDll.cpp : Defines the initialization routines for the DLL.
//
#include "stdafx.h"
#include <afxdllx.h>
#include<iostream>
#include <string>
using namespace std;
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
static AFX_EXTENSION_MODULE CutScreenDllDLL = { NULL, NULL };
extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved);
if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("CUTSCREENDLL.DLL Initializing!\n");
// Extension DLL one-time initialization
if (!AfxInitExtensionModule(CutScreenDllDLL, hInstance))
return 0;
// Insert this DLL into the resource chain
// NOTE: If this Extension DLL is being implicitly linked to by
// an MFC Regular DLL (such as an ActiveX Control)
// instead of an MFC application, then you will want to
// remove this line from DllMain and put it in a separate
// function exported from this Extension DLL. The Regular DLL
// that uses this Extension DLL should then explicitly call that
// function to initialize this Extension DLL. Otherwise,
// the CDynLinkLibrary object will not be attached to the
// Regular DLL's resource chain, and serious problems will
// result.
new CDynLinkLibrary(CutScreenDllDLL);
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("CUTSCREENDLL.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(CutScreenDllDLL);
}
return 1; // ok
}
void Screen(char filename[])
{
CDC *pDC;//屏幕DC
pDC = CDC::FromHandle(GetDC(NULL));//获取当前整个屏幕DC
int BitPerPixel = pDC->GetDeviceCaps(BITSPIXEL);//获得颜色模式
int Width = pDC->GetDeviceCaps(HORZRES);
int Height = pDC->GetDeviceCaps(VERTRES);
cout << "当前屏幕色彩模式为" << BitPerPixel << "位色彩" << endl
<< "屏幕宽度：" << Width << endl
<< "屏幕高度：" << Height << endl << endl;
CDC memDC;//内存DC
memDC.CreateCompatibleDC(pDC);
CBitmap memBitmap, *oldmemBitmap;//建立和屏幕兼容的bitmap
memBitmap.CreateCompatibleBitmap(pDC, Width, Height);
oldmemBitmap = memDC.SelectObject(&memBitmap);//将memBitmap选入内存DC
memDC.BitBlt(0, 0, Width, Height, pDC, 0, 0, SRCCOPY);//复制屏幕图像到内存DC
//以下代码保存memDC中的位图到文件
BITMAP bmp;
memBitmap.GetBitmap(&bmp);//获得位图信息
FILE *fp = fopen(filename, "w+b");
BITMAPINFOHEADER bih = {0};//位图信息头
bih.biBitCount = bmp.bmBitsPixel;//每个像素字节大小
bih.biCompression = BI_RGB;
bih.biHeight = bmp.bmHeight;//高度
bih.biPlanes = 1;
bih.biSize = sizeof(BITMAPINFOHEADER);
bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;//图像数据大小
bih.biWidth = bmp.bmWidth;//宽度
BITMAPFILEHEADER bfh = {0};//位图文件头
bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);//到位图数据的偏移量
bfh.bfSize = bfh.bfOffBits + bmp.bmWidthBytes * bmp.bmHeight;//文件总的大小
bfh.bfType = (WORD)0x4d42;
fwrite(&bfh, 1, sizeof(BITMAPFILEHEADER), fp);//写入位图文件头
fwrite(&bih, 1, sizeof(BITMAPINFOHEADER), fp);//写入位图信息头
byte * p = new byte[bmp.bmWidthBytes * bmp.bmHeight];//申请内存保存位图数据
GetDIBits(memDC.m_hDC, (HBITMAP) memBitmap.m_hObject, 0, Height, p,
(LPBITMAPINFO) &bih, DIB_RGB_COLORS);//获取位图数据
fwrite(p, 1, bmp.bmWidthBytes * bmp.bmHeight, fp);//写入位图数据
delete [] p;
fclose(fp);
memDC.SelectObject(oldmemBitmap);
}
wr中的代码
load_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");
filename[0]="a";
extern int Screen(filename);#跑到这里出现如图所示提示框
Screen(filename);//调用Screen函数
unload_dll("E:\\VC\\CutScreenDll\\Debug\\CutScreenDll.dll");
