用Visual C++实现屏幕抓图程序

DLL中的两个输出函数分别用来添加/删除热键，函数代码如下：

BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR

cKey,UCHAR cMask)

{

BOOL bAdded=FALSE;

for(int index=0;index<MAX_KEY;index++){

if(hCallWnd[index]==0){

hCallWnd[index]=hWnd;

HotKey[index]=cKey;

HotKeyMask[index]=cMask;

bAdded=TRUE;

KeyCount++;

break;

}

}

return bAdded;

}

//删除热键

BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)

{

BOOL bRemoved=FALSE;

for(int index=0;index<MAX_KEY;index++){

if(hCallWnd[index]==hWnd){

if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){

hCallWnd[index]=NULL;

HotKey[index]=0;

HotKeyMask[index]=0;

bRemoved=TRUE;

KeyCount--;

break;

}

}

}

return bRemoved;

}

DLL中的钩子函数如下：

LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)

{

BOOL bProcessed=FALSE;

if(HC_ACTION==nCode)

{

if((lParam&0xc0000000)==0xc0000000){// 有键松开

switch(wParam)

{

case VK_MENU:

MaskBits&=~ALTBIT;

break;

case VK_CONTROL:

MaskBits&=~CTRLBIT;

break;

case VK_SHIFT:

MaskBits&=~SHIFTBIT;

break;

default: //judge the key and send message