在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
mI$<+S1!
\&[Jtv * 一、实现方法
}02#[vg nw.,`M,N 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
I%4)% g3fxf(iY( #pragma data_seg("shareddata")
no~Yet+<" HHOOK hHook =NULL; //钩子句柄
6A$
Y]u UINT nHookCount =0; //挂接的程序数目
`=}w(V8pc static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)uG7 DR static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/RWQ+Zf-Y] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
"`va_Mk static int KeyCount =0;
F0Nl,9h(' static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
roiUVisq* #pragma data_seg()
whoM$ & *!mT#Vm^ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
QB3vp4pBg@ =x_~7 Xc{ 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:
CP5vo-/)- x-hr64WFK BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
QYS 1.k cKey,UCHAR cMask)
zc1y)s0G {
NA=I7I@ BOOL bAdded=FALSE;
!PAuMj)P for(int index=0;index<MAX_KEY;index++){
s2IjZF { if(hCallWnd[index]==0){
D]P_tJI hCallWnd[index]=hWnd;
T6Oah:50EM HotKey[index]=cKey;
B\ <;e HotKeyMask[index]=cMask;
#L3heb&9 bAdded=TRUE;
obRYU|T KeyCount++;
t@ _MWF break;
W##~gqZ/ }
cN{(XmX5n }
) (4.7> return bAdded;
3zr95$Mt }
t9C.|6X //删除热键
vJ&g3ky BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-gq,^j5, {
|(evDS5 BOOL bRemoved=FALSE;
F]fBFDk for(int index=0;index<MAX_KEY;index++){
`l%)0)T if(hCallWnd[index]==hWnd){
m|/q
o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fV>12ici hCallWnd[index]=NULL;
Z?@oe-mz HotKey[index]=0;
`]T#uP<u HotKeyMask[index]=0;
zyHHz\{ bRemoved=TRUE;
fN|'aq*Pd KeyCount--;
!e<D2><^ break;
CO<P$al }
MS>QU@z7c }
Kw/7X[|'G }
%}`zq8Q; return bRemoved;
_MmSi4]yd }
1:.I0x! ~uUN\qx52 QTC-W2t] DLL中的钩子函数如下:
XCP/e p D_)i%k\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
GW;\3@o {
X5Fi
, /H BOOL bProcessed=FALSE;
79yF { if(HC_ACTION==nCode)
>Q-"-X1 {
Vw@?t(l > if((lParam&0xc0000000)==0xc0000000){// 有键松开
o`{@':%D` switch(wParam)
cYeC7l" {
rFJPeK7 case VK_MENU:
VfFXH,j MaskBits&=~ALTBIT;
S.! n35 break;
mne?r3d case VK_CONTROL:
kGkfLY6B MaskBits&=~CTRLBIT;
?D,8lABkT break;
`B%IHr case VK_SHIFT:
q+J;^u"E MaskBits&=~SHIFTBIT;
x^959QO~ break;
^C|N default: //judge the key and send message
zHg1K,t: break;
l|Y?]LNr }
C25EIIdRb for(int index=0;index<MAX_KEY;index++){
UVUoXv)N if(hCallWnd[index]==NULL)
7`pK=E}+ continue;
cvk$ I"q+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`^G?+p2E {
"BvAiT{u SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
L"(k;Mfe bProcessed=TRUE;
,| Zkpn8 }
?E6C|A$I }
cq0#~20 }
+\yQZ{4'@ else if((lParam&0xc000ffff)==1){ //有键按下
-"}mmTa*< switch(wParam)
j` 5K7~hv {
5<RZht$i case VK_MENU:
1(`UzC=R| MaskBits|=ALTBIT;
Pe`eF(J break;
M\!z='Fi case VK_CONTROL:
ibqJ'@{=e MaskBits|=CTRLBIT;
5f-eWW]! break;
;X}!;S%K case VK_SHIFT:
T[\?fSP MaskBits|=SHIFTBIT;
6p)dO
c3L break;
@ |^;d default: //judge the key and send message
Ni
Y.OwKr break;
NN"!kuM }
o'*7I|7a for(int index=0;index<MAX_KEY;index++){
g?1! /+ if(hCallWnd[index]==NULL)
wyC1M continue;
?rSm6V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6)#=@i`
\ {
[6}>? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F&6Xo]? bProcessed=TRUE;
bL9XQ:$C }
,+U,(P5>s }
2)4oe }
EL gq#z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
~^ ^|]s3 for(int index=0;index<MAX_KEY;index++){
Pu `;B if(hCallWnd[index]==NULL)
b!gvvg< continue;
g7g^iLU if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
tEl_a~s*3? SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
a`E1rK' //lParam的意义可看MSDN中WM_KEYDOWN部分
+)U>mm, }
--BS/L- }
tjWf`#tH>H }
oRZ--1oR_ return CallNextHookEx( hHook, nCode, wParam, lParam );
4cQ|"sOzD }
rI;84=v2&9 fKkH
[ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
d'UCPg<Y -d8U Hc BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2r*Yd(e BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
fb;y*-?# K)_DaTmi) 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
6Sr}I,DG cwC-)#R'] LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1J?x2 {
89+Q^79m if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
&
G8tb>q<V {
#Ks2a):8 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
=1e>$E# SaveBmp();
Y-y<gW return FALSE;
9yWQ}h }
R\ZyS
)~l …… //其它处理及默认处理
$9Pscu bM4 }
gzd)7np B2 ["}Yp [
m#|[% 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
j" ~gEGfK Izr_]% 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
$*N)\>~X IWs)n1D*] 二、编程步骤
;Q8LA",5d e>~7RN 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Puodsd xp;CYr"1} 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
uYy&<_r k*"FMJG_ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
O$,bNu/g ZMn~QU_5 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
)a0%62 x2@W,?oPm 5、 添加代码,编译运行程序。
~Jlo> `zjbyY 三、程序代码
9S!
2r Di>B:= ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/+g)J0u #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Lcow2 SbH #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
EN/e`S$) #if _MSC_VER > 1000
s$PPJJT{b #pragma once
WB(Gx_o3 #endif // _MSC_VER > 1000
o5`LLVif5y #ifndef __AFXWIN_H__
`;BpdG(m #error include 'stdafx.h' before including this file for PCH
;rjd?r #endif
]^c]* O[8 #include "resource.h" // main symbols
'pQ\BH class CHookApp : public CWinApp
wD|I^y; {
=lG/A[66 public:
{(j1#9+9 CHookApp();
,[{Z_co // Overrides
FdFN4{<QZ // ClassWizard generated virtual function overrides
|xX>AMZc)D //{{AFX_VIRTUAL(CHookApp)
3Sh#7"K3 public:
aZBb@~Y virtual BOOL InitInstance();
X$(Dem virtual int ExitInstance();
D5gDVulsh
//}}AFX_VIRTUAL
$Q'S8TU //{{AFX_MSG(CHookApp)
e=#'rDm // NOTE - the ClassWizard will add and remove member functions here.
rUOl+p_47 // DO NOT EDIT what you see in these blocks of generated code !
*CS2ndp //}}AFX_MSG
Y}UVC|Ef DECLARE_MESSAGE_MAP()
k<i#agq };
LktH*ePO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
NpN-''B\ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>2[nTfS BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Vb$4'K' BOOL InitHotkey();
@b5zHXF83E BOOL UnInit();
.M zAkZ= #endif
Wv4o:_} OS7^S1r- //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
E
whCX'Vaj #include "stdafx.h"
Lj#K^c Ee #include "hook.h"
/hksESiU #include <windowsx.h>
g+ P
#ifdef _DEBUG
8 O% ?t #define new DEBUG_NEW
T=D|jt #undef THIS_FILE
wOU\&u| static char THIS_FILE[] = __FILE__;
nBo?r}t4 #endif
# @~HpqqR #define MAX_KEY 100
~4'AnoD1w #define CTRLBIT 0x04
0oiz V;B5% #define ALTBIT 0x02
[8$K i$; #define SHIFTBIT 0x01
QnN cGH #pragma data_seg("shareddata")
M#a1ev HHOOK hHook =NULL;
1xsIM'& UINT nHookCount =0;
y3{F\K static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
##_Jz 5P static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
SE;Yb' static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
2?./S)x) static int KeyCount =0;
yG..B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
V_p[mSKJv #pragma data_seg()
d]!`II HINSTANCE hins;
5?M d void VerifyWindow();
'vc>uY BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
io^L[ //{{AFX_MSG_MAP(CHookApp)
75?z" i // NOTE - the ClassWizard will add and remove mapping macros here.
H\!p%Y // DO NOT EDIT what you see in these blocks of generated code!
m. EIMuj //}}AFX_MSG_MAP
P<s0f:". END_MESSAGE_MAP()
zvAUF8'_ 6X`i*T$. CHookApp::CHookApp()
5zk^zn) {
G ,fh/E+ // TODO: add construction code here,
' En|-M5 // Place all significant initialization in InitInstance
DLBHZ?+! }
C0v1x=(xiM (#?k|e"Y"` CHookApp theApp;
jSc!"Trl] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
U\~9YX8 {
!wNj;ST* BOOL bProcessed=FALSE;
(eEs0 if(HC_ACTION==nCode)
!eE;MaS> {
6! .nj3$* if((lParam&0xc0000000)==0xc0000000){// Key up
:+*q,lX8 switch(wParam)
9qcA+gz:| {
pS6p}S=1] case VK_MENU:
pB0p?D)n MaskBits&=~ALTBIT;
3 jR I@ break;
Z\. n6 case VK_CONTROL:
%!X9>i> MaskBits&=~CTRLBIT;
[3|&!:4g6 break;
Z(c3GmY case VK_SHIFT:
-{O>'9'1A MaskBits&=~SHIFTBIT;
JVxGS{Z break;
+0Z,#b default: //judge the key and send message
J,SP1-L break;
t]14bf$*Q }
IF~E; for(int index=0;index<MAX_KEY;index++){
/;{E}` if(hCallWnd[index]==NULL)
sDXD>upO continue;
vnr{Ekg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9Q/t+ {
x,81#=m^h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
::`#qa4! bProcessed=TRUE;
$L kTu }
K*id
1YY }
OAw- -rl }
aP&bW))CI else if((lParam&0xc000ffff)==1){ //Key down
8gn12._x switch(wParam)
d.3cd40Q {
@]F1J case VK_MENU:
o7i>D6^^ MaskBits|=ALTBIT;
:f_fp(T break;
xmXuBp:M(R case VK_CONTROL:
!!:mjq<0 MaskBits|=CTRLBIT;
19j"Zxdg Y break;
xm$-:N0q case VK_SHIFT:
}huFv*<@' MaskBits|=SHIFTBIT;
{'@`:p&3r break;
a2%xW_e default: //judge the key and send message
Swr
8 break;
*'to#_n&W
}
``:+*4e9 for(int index=0;index<MAX_KEY;index++)
kWMz;{I5*w {
l' mdj!{& if(hCallWnd[index]==NULL)
`p'682x I continue;
,7h0y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"zZZ h {
bGtS! 'I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6Q*Zy[= bProcessed=TRUE;
*YO^+]nmY }
N5d)&a
7? }
gzd<D}2F~ }
$H8B%rT] if(!bProcessed){
<{P`A%g@ for(int index=0;index<MAX_KEY;index++){
4^(aG7 if(hCallWnd[index]==NULL)
YG_|L[/# continue;
Q&]f9j_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
-qqI@+u+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
G0~6A@> }
4..M *U }
[JVEKc ym }
ORx6r=zg return CallNextHookEx( hHook, nCode, wParam, lParam );
qd<-{ }
nghpWODq v2l*n BOOL InitHotkey()
cw3j&k {
N@#,Y nPI if(hHook!=NULL){
Lm3~< vP1e nHookCount++;
=n<Lbl(7 return TRUE;
CC
B' }
:Xi&H.k)p else
Ms
3Sri hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
u*=8s5Q[ if(hHook!=NULL)
<BiSx nHookCount++;
V|&->9" return (hHook!=NULL);
A9_}RJ9 }
!9t,#?! BOOL UnInit()
`n?Rxhkwp {
dt|| nF if(nHookCount>1){
hN^,'O nHookCount--;
.]w=+~h return TRUE;
[9^lAhX }
("KtJ BOOL unhooked = UnhookWindowsHookEx(hHook);
lG5KZ[/Or if(unhooked==TRUE){
`Kbf]"4q nHookCount=0;
8+@j %l j hHook=NULL;
=6'Fm$R }
6,cJ3~!48 return unhooked;
|/;;uK,y }
p1N3AhXY UQ#t & BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GIZw/L7Yb {
VVJIJ9L&C BOOL bAdded=FALSE;
9? y&/D5O for(int index=0;index<MAX_KEY;index++){
*3\*GatJ if(hCallWnd[index]==0){
=Hbf()cN) hCallWnd[index]=hWnd;
P W_"JZ HotKey[index]=cKey;
`gAW5 i-z5 HotKeyMask[index]=cMask;
Z`<5SHQd bAdded=TRUE;
oy-y QYX KeyCount++;
H/U.Bg 4 break;
v\o
m }
l;d4Le }
C#LTF-$]) return bAdded;
/>n!2'! }
`a `>Mtl yV*jc`1
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;,/4Ry22j- {
0^vz /y1c BOOL bRemoved=FALSE;
Lpohc4d[V for(int index=0;index<MAX_KEY;index++){
@jCMQYR if(hCallWnd[index]==hWnd){
%xrldn% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3i1TBhs6 hCallWnd[index]=NULL;
Ae\:{[c_D HotKey[index]=0;
{T-=&%|| HotKeyMask[index]=0;
x[=,$;o+ bRemoved=TRUE;
3Cgv($xl& KeyCount--;
$0R5 ]]db) break;
=o4gW`\z }
q P0UcG }
mUy>w }
OS-k_l L return bRemoved;
f0879(,i }
$zM \Jd (&SPMhs_|( void VerifyWindow()
RzU9]e {
:{
iK 5 for(int i=0;i<MAX_KEY;i++){
5"y)<VLJX if(hCallWnd
!=NULL){ A4g,)
if(!IsWindow(hCallWnd)){ cJf&R^[T
hCallWnd=NULL; )t((x
HotKey=0; U1 `pY:P
HotKeyMask=0; MOPHu
O{^
KeyCount--; !mmSF1f
} Tm$8\c4V:*
} w
_4O;
} [dFe-2u ,$
} `=S%!akj
x2TE[#><
BOOL CHookApp::InitInstance() jvxCCYXR
{ ,Wtgj=1!.
AFX_MANAGE_STATE(AfxGetStaticModuleState()); +:W/=C
d(h
hins=AfxGetInstanceHandle(); &dPUd~&EL
InitHotkey(); 3?D{iMRM
return CWinApp::InitInstance(); :|8!w
} ;66{S'*[
T(,@]=d,DD
int CHookApp::ExitInstance() V>`9ey!U
{ 5`@yX[G
VerifyWindow(); 3,EtyJ3[Bh
UnInit(); 4]FS
jVO
return CWinApp::ExitInstance(); !Na@T]J
} 6v74mIRn'?
2I|lY>Z
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v}id/brl
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) f'bwtjO
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~!M"
#if _MSC_VER > 1000 Nf)SR#;
#pragma once =dwy 4
#endif // _MSC_VER > 1000 "&{.g1i9
6J_$dzw
class CCaptureDlg : public CDialog :;c`qO4
{ gW^4@q
// Construction p"7[heExw
public: HYG1BfEaW
BOOL bTray; O \gVB!x
BOOL bRegistered; &-w. rF@
BOOL RegisterHotkey(); ]q"y P0
UCHAR cKey; wz{c;v\J^
UCHAR cMask; C4GkFD
void DeleteIcon(); r i)`e
void AddIcon(); Ms5R7<O.7
UINT nCount; #
2FrP5rC
void SaveBmp(); 0fLd7*1>
CCaptureDlg(CWnd* pParent = NULL); // standard constructor -knP5"TB
// Dialog Data =Ot_P7'5gv
//{{AFX_DATA(CCaptureDlg) K"hnGYt?
enum { IDD = IDD_CAPTURE_DIALOG }; 4'tY1d
CComboBox m_Key; ]omBq<ox'Y
BOOL m_bControl; 'vYt_T
BOOL m_bAlt; !]5V{3
BOOL m_bShift; 17`-eDd
CString m_Path; M`8c|*G
CString m_Number; hd,O/-m#
//}}AFX_DATA 4CtWEq
// ClassWizard generated virtual function overrides yu@Pd3
//{{AFX_VIRTUAL(CCaptureDlg) `~_H\_JpO
public: ~]`U)Aw
virtual BOOL PreTranslateMessage(MSG* pMsg); d(:I~m
protected: m>3\1`ZF~<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o?cNH
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vR>GE?s6
//}}AFX_VIRTUAL eKLE^`2*@
// Implementation l_8ibLyo
protected: F@#p
HICON m_hIcon; .XVL JJ#
// Generated message map functions 4#.Q|vyl]"
//{{AFX_MSG(CCaptureDlg) mg>wv[ 7
virtual BOOL OnInitDialog(); HIt9W]koO
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); keG\-f
afx_msg void OnPaint(); gIIF17|Z
afx_msg HCURSOR OnQueryDragIcon(); 6__HqBQ
virtual void OnCancel(); ^t *Ba>A
afx_msg void OnAbout(); 1*'gaa&y
afx_msg void OnBrowse(); !N_eZPU.v
afx_msg void OnChange(); US"UkY-\
//}}AFX_MSG Pp_? z0M
DECLARE_MESSAGE_MAP() Ra6 }<o
}; HuKOb4g
#endif g$vOWSI+
Ct zWdo.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .JJ50p
#include "stdafx.h" `I4E':
ZG
#include "Capture.h" F~hH>BH9
#include "CaptureDlg.h" *cCj*Zr]
#include <windowsx.h> kY6_n4
#pragma comment(lib,"hook.lib") ]=]MJ3_7
#ifdef _DEBUG eAqpP>9n
#define new DEBUG_NEW 3OY(L`
#undef THIS_FILE &}|`h8JA]K
static char THIS_FILE[] = __FILE__; @?;)x&<8?3
#endif JoZzX{eu"
#define IDM_SHELL WM_USER+1 H0yM`7[y
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e
'F:LMX
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sY?wQ:
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rx@i.+
class CAboutDlg : public CDialog !,rF(pz
{ O3%#Q3c>3
public: fZLAZMrM
CAboutDlg(); 8<32(D{
// Dialog Data E1`_[=8a9
//{{AFX_DATA(CAboutDlg) +(z[8BJl
enum { IDD = IDD_ABOUTBOX }; ,U+>Q!$`\^
//}}AFX_DATA J, +/<Y!
// ClassWizard generated virtual function overrides ~O!E &~
//{{AFX_VIRTUAL(CAboutDlg) -v|lM8
protected: g!r)yzK
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PnB2a'(^@?
//}}AFX_VIRTUAL <OJqeUo+*\
// Implementation $!_} d
protected: <b\8<mTr
//{{AFX_MSG(CAboutDlg) NS TO\36
//}}AFX_MSG AxF$7J(
DECLARE_MESSAGE_MAP() Ul'H(eH.v
}; 1mR@Bh
52,'8`
]
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6D`.v@
{ -^;,m=4{3
//{{AFX_DATA_INIT(CAboutDlg)
U z[#ye
//}}AFX_DATA_INIT NR-<2
e3
} OsVz[w N
9C7HL;MF
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (:%t
{ )vg@Kc26
CDialog::DoDataExchange(pDX); h0$ \JXk
//{{AFX_DATA_MAP(CAboutDlg) \OWxf[
//}}AFX_DATA_MAP Lxv_{~I*
} tw.z5
<X5ge>.
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $fT#Wva-\d
//{{AFX_MSG_MAP(CAboutDlg) ,t9CP
// No message handlers -mo4`F
//}}AFX_MSG_MAP <]|!quY<*
END_MESSAGE_MAP() yX%> %#$
8<KC-|y.
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ol>/^3a=
: CDialog(CCaptureDlg::IDD, pParent) \5=4!Ez
{ C@-cLk
//{{AFX_DATA_INIT(CCaptureDlg) ^ P
A|RFP
m_bControl = FALSE; PI,2b(`h_
m_bAlt = FALSE; Ml{4)%~Y7f
m_bShift = FALSE; UlKg2p
m_Path = _T("c:\\"); l|vT[X/g
m_Number = _T("0 picture captured."); "?W8o[c+
nCount=0; !x||ObW\H
bRegistered=FALSE; !L3|5:j
bTray=FALSE;
bk i:u
//}}AFX_DATA_INIT 9>vB,8
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &Fjyi"8(r
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); : t75iB=
} aD6!x3c/
7 n^1H[q
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cS@p`A7Tpo
{ 8493O x4 O
CDialog::DoDataExchange(pDX); i=pfjC
//{{AFX_DATA_MAP(CCaptureDlg) </SO#g^r<
DDX_Control(pDX, IDC_KEY, m_Key); kE!ky\E
DDX_Check(pDX, IDC_CONTROL, m_bControl); +%~me?
DDX_Check(pDX, IDC_ALT, m_bAlt); A1z<2.R
DDX_Check(pDX, IDC_SHIFT, m_bShift); hewc5vrL
DDX_Text(pDX, IDC_PATH, m_Path); P=9UK`n
DDX_Text(pDX, IDC_NUMBER, m_Number); w
!<-e>
//}}AFX_DATA_MAP PpNG`_O
} ^EW6}oj[
NqFfz9G)
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v:>sS_^
//{{AFX_MSG_MAP(CCaptureDlg)
J9y}rGO
ON_WM_SYSCOMMAND() +bb-uoZf
ON_WM_PAINT() wqap~X
ON_WM_QUERYDRAGICON() S@~ReRew2
ON_BN_CLICKED(ID_ABOUT, OnAbout) R?N+./{
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Nd@/U
c
ON_BN_CLICKED(ID_CHANGE, OnChange) 02(Ob
//}}AFX_MSG_MAP c|(Q[=
END_MESSAGE_MAP() $YJi]:3&
wsc=6/#u
BOOL CCaptureDlg::OnInitDialog() 3vQVk
{ m")p]B&i=
CDialog::OnInitDialog(); 0Jd>V
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KF!d?
ASSERT(IDM_ABOUTBOX < 0xF000); l2wu>Ar7.
CMenu* pSysMenu = GetSystemMenu(FALSE); d>r ]xXB6
if (pSysMenu != NULL) J*ZcZ FbWN
{ /c4$m3?]
CString strAboutMenu; p!<PRms@
strAboutMenu.LoadString(IDS_ABOUTBOX); )oM%
N
if (!strAboutMenu.IsEmpty()) uaCI2I
{ c]qh)F$s8
pSysMenu->AppendMenu(MF_SEPARATOR); :3J`+V}9;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]XL=S|tIq
} C{G%"q
} yLl:G;
SetIcon(m_hIcon, TRUE); // Set big icon [[ Nn~7
SetIcon(m_hIcon, FALSE); // Set small icon LA(/UA3Izd
m_Key.SetCurSel(0); kK0zb{
RegisterHotkey(); 9'|_1Q.b^
CMenu* pMenu=GetSystemMenu(FALSE); /;u=#qu(E-
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ')2LP;(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); q%)."10}]
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ltkA7dUbu
return TRUE; // return TRUE unless you set the focus to a control UF}Ji#fqn
} ygK,t*T20
W&3,XFnI_
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1:u~T@;" `
{ PfhKomt"
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "{~^EQq,
{ J'L6^-gV
CAboutDlg dlgAbout; hVJ}EF0
dlgAbout.DoModal(); d4A:XNKB
} Q#&6J =}
else B&EUvY '
{ ?f!&M
CDialog::OnSysCommand(nID, lParam); e. E$Ej]w
} zcio\P=^|B
} `nc=@" 1
n*#HokX
void CCaptureDlg::OnPaint() _U,Hi?b"$}
{ t+,2 p|B
if (IsIconic()) 0a,B&o1
{ +]~}kvk:
CPaintDC dc(this); // device context for painting hxw6^EA
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %xp 69
// Center icon in client rectangle ?]+!gz1
int cxIcon = GetSystemMetrics(SM_CXICON); >J:liB|(
int cyIcon = GetSystemMetrics(SM_CYICON); 8zjJshE/
CRect rect; b/E3Kse?
GetClientRect(&rect); *hpS/g/3\
int x = (rect.Width() - cxIcon + 1) / 2; R(f%*S4
int y = (rect.Height() - cyIcon + 1) / 2; ndk~(ex|j
// Draw the icon wawJZ+V
dc.DrawIcon(x, y, m_hIcon); lt\Bm<"z!1
} &F'n
>QT9q
else p>+Q6o9O
{ B@' OUcUR
CDialog::OnPaint(); [3x*47o "z
} 20:![/7:!
} !?K#f?x<?
!|mzu1S
HCURSOR CCaptureDlg::OnQueryDragIcon() 6;M{suG|
{ _~2o
return (HCURSOR) m_hIcon; f%q ?
} SI=7$8T5=5
Ldy(<cN
void CCaptureDlg::OnCancel() ITz+O=I4R]
{ 3XncEdy_
if(bTray) BJp~/H`vd
DeleteIcon(); %P C[-(Q
CDialog::OnCancel(); 3aJYl3:0B
} ]v+yeGIK S
f'Oj01[
void CCaptureDlg::OnAbout() 9j0o)]
{ ZJ/K MW
CAboutDlg dlg; 3 k/X;:,.
dlg.DoModal(); hdH3Jb_hl(
} FgR9$ is+
FB3}M)G>M
void CCaptureDlg::OnBrowse() Q0g^%
{ JC/nHM
CString str; ih: XC
BROWSEINFO bi; R\x3'([A5
char name[MAX_PATH]; #f_.
ZeroMemory(&bi,sizeof(BROWSEINFO)); 02YmV%
bi.hwndOwner=GetSafeHwnd(); $Xs`'>,"
bi.pszDisplayName=name; IUD@Kf]S
bi.lpszTitle="Select folder"; Bt(nm>Ng
bi.ulFlags=BIF_RETURNONLYFSDIRS; Sb }=j;F
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Kv ajk~
if(idl==NULL) |!CAxE0d$B
return; :xY9eq=
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0aJcX)
str.ReleaseBuffer(); f7;<jj;w7
m_Path=str; #W4
" ^#2
if(str.GetAt(str.GetLength()-1)!='\\') T5dnj&N ]
m_Path+="\\"; 0u
+_D8G
UpdateData(FALSE); `:Oje
} jZiz 0[
L08lkq,
void CCaptureDlg::SaveBmp() %Vk77(
{ mgb+HNH%q\
CDC dc; h:KEhj\d?
dc.CreateDC("DISPLAY",NULL,NULL,NULL); !bCaDTz
CBitmap bm; h&rZR`g
int Width=GetSystemMetrics(SM_CXSCREEN); Q9&H/]"v
int Height=GetSystemMetrics(SM_CYSCREEN); %Y9CZRY9
bm.CreateCompatibleBitmap(&dc,Width,Height); vX&W;&
CDC tdc; /*t H$\6*
tdc.CreateCompatibleDC(&dc); gO m8 O,
CBitmap*pOld=tdc.SelectObject(&bm); {/qQ=$t
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O.jCDAP
tdc.SelectObject(pOld); z:&/O&?
BITMAP btm; ;R$2+9
bm.GetBitmap(&btm); !%N@>[
DWORD size=btm.bmWidthBytes*btm.bmHeight; VL|Z+3L
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bKEiS8x
BITMAPINFOHEADER bih; 3`Xzp
bih.biBitCount=btm.bmBitsPixel; dq0!.gBT2
bih.biClrImportant=0; /<"ok;Pu7
bih.biClrUsed=0; K{ntl-D&y
bih.biCompression=0; wEQZ9?\
bih.biHeight=btm.bmHeight; msQ?V&+<
bih.biPlanes=1; LG??Q+`l
bih.biSize=sizeof(BITMAPINFOHEADER); 1jpft3*x
bih.biSizeImage=size; bL5u;iy)
bih.biWidth=btm.bmWidth; ?.Ip(g
bih.biXPelsPerMeter=0; %l!-rXp
bih.biYPelsPerMeter=0; ZVrZkd`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8d&%H,
static int filecount=0; |OuIQhoE
CString name; _ER. AKY
name.Format("pict%04d.bmp",filecount++); `A-
name=m_Path+name; JoD@e[(
BITMAPFILEHEADER bfh; [$#G|> x
bfh.bfReserved1=bfh.bfReserved2=0; u-QHV1H`(
bfh.bfType=((WORD)('M'<< 8)|'B'); 6MLjU1
bfh.bfSize=54+size; OP\L
bfh.bfOffBits=54; $oPc,zS-gL
CFile bf; ,wngS=
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )jh~jU? c@
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e\!Aoky
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yI^7sf7k
bf.WriteHuge(lpData,size); R*2F)e\|
bf.Close(); .Ad9(s
nCount++; \9`.jB~<
} *Rxn3tR7
GlobalFreePtr(lpData); Rr}m(e=
if(nCount==1) gMp' S
m_Number.Format("%d picture captured.",nCount); oN`khS]_v0
else ` $q0fTz
m_Number.Format("%d pictures captured.",nCount); qqys`.
UpdateData(FALSE); 9_ZGb"(Lj
} \ _?d?:#RD
T1'\!6_5
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5=R]1YI~$
{ -aV(6i*n
if(pMsg -> message == WM_KEYDOWN) Q 9E.AN
{ &y7xL-xP
if(pMsg -> wParam == VK_ESCAPE) +k[w)7Q
return TRUE; 9!.S9[[N
if(pMsg -> wParam == VK_RETURN) UD9JE S,
return TRUE; }7_$[r'_oI
} 0
ZSn r+
return CDialog::PreTranslateMessage(pMsg); rinTB|5
} U*,\UF
d]MpE9@'v
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OL_jU2,fv
{ fK2r6D9
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T6."j_
SaveBmp(); #T@k(Bz{L
return FALSE; 2\;/mQI2A
} HJP~
lg
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |dDKO
CMenu pop; ZT8LMPC
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X~SNkM
CMenu*pMenu=pop.GetSubMenu(0); "oyBF CW
pMenu->SetDefaultItem(ID_EXITICON); \xcf<y3_
CPoint pt; KP7 {
GetCursorPos(&pt); wuW{2+)B
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8H`L8:
CM
if(id==ID_EXITICON) 'sE["eC
DeleteIcon(); 5=%KK3
else if(id==ID_EXIT) iio-RT?!
OnCancel(); Kmw #Q`
return FALSE; G6+6uWvl
} )PW|RW
LRESULT res= CDialog::WindowProc(message, wParam, lParam); EY:H\4)
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p}5413z5Z=
AddIcon(); oB~V~c}8x
return res; @;N(3| n7
} lxr;AJ(
j(k}NWPH
void CCaptureDlg::AddIcon() `r-3"or/$
{ $cU7)vmK`
NOTIFYICONDATA data; B2|0.G|[j
data.cbSize=sizeof(NOTIFYICONDATA); DIJmISk
CString tip; IAmZ_2
tip.LoadString(IDS_ICONTIP); B<HN$/
data.hIcon=GetIcon(0); L&~' SC
data.hWnd=GetSafeHwnd(); upX@8WxR
strcpy(data.szTip,tip); c((bUjS'=Y
data.uCallbackMessage=IDM_SHELL; lJdYR'/Wd
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; j;
R20xf 0
data.uID=98; ^@{"a
Shell_NotifyIcon(NIM_ADD,&data); *u",-n
ShowWindow(SW_HIDE); <]X6%LX
bTray=TRUE; 9X
+dp
} FFN Sn
L./c#b!{
void CCaptureDlg::DeleteIcon() g-1j#V`5
{ X$6QQnyR
NOTIFYICONDATA data; (E,Ibz2G:e
data.cbSize=sizeof(NOTIFYICONDATA); adAdX;@e`
data.hWnd=GetSafeHwnd(); zqBzataR:
data.uID=98; \ 9iiS(e
Shell_NotifyIcon(NIM_DELETE,&data); gNc;P[
ShowWindow(SW_SHOW); WW>m`RU`
SetForegroundWindow(); Tj{3#?]Ho
ShowWindow(SW_SHOWNORMAL); .wyuB;:
bTray=FALSE; $G5:/,Q
} El: @l%
&Yc'X+'4
void CCaptureDlg::OnChange() es~1@Jb
{ 3^xq+{\)
RegisterHotkey(); +l.LwA
} &U7h9o H
MvnQUZ
BOOL CCaptureDlg::RegisterHotkey() = ^Vp \
{ rHk,OC
UpdateData(); WiZTE(NM`
UCHAR mask=0; .l5-i@=W
UCHAR key=0; . UH'U\M
if(m_bControl) 8n-Xt7z
mask|=4; IV1Y+Z )
if(m_bAlt) Dln1 R[
mask|=2; 9%"`9j~H>
if(m_bShift) ,D]g]#Lq
mask|=1; 72.Msnn
key=Key_Table[m_Key.GetCurSel()]; pnyu&@e
if(bRegistered){ Bq1}"092
DeleteHotkey(GetSafeHwnd(),cKey,cMask); #NYHwO<0-
bRegistered=FALSE; ';c 6
} ?Zsh\^k.g
cMask=mask; ^8J`*R8CL
cKey=key; *Ms"{+C
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); IkjJqz
return bRegistered; 6x=w-32+ y
} zSU,le
}6<5mq)%
四、小结 [u37Hy_Gi
#z<#oC5
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。