Question

我已经看到following code截取屏幕截图并将其保存为jpg，我已设法将其编译并运行为win32 CONSOLE应用程序，

但是当我尝试在WindowsForm / CLI中使用以下代码（只有一个应该截屏的按钮）项目时，我收到了以下错误：

1>screenshoter.obj : warning LNK4248: unresolved typeref token (0100002C) for 'Gdiplus.GpCachedBitmap'; image may not run
1>screenshoter.obj : error LNK2028: unresolved token (0A000017) "extern "C" int __stdcall ReleaseDC(struct HWND__ *,struct HDC__ *)" (?ReleaseDC@@$$J18YGHPAUHWND__@@PAUHDC__@@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A000018) "extern "C" int __stdcall DeleteObject(void *)" (?DeleteObject@@$$J14YGHPAX@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A000019) "extern "C" int __stdcall BitBlt(struct HDC__ *,int,int,int,int,struct HDC__ *,int,int,unsigned long)" (?BitBlt@@$$J236YGHPAUHDC__@@HHHH0HHK@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A00001A) "extern "C" void * __stdcall SelectObject(struct HDC__ *,void *)" (?SelectObject@@$$J18YGPAXPAUHDC__@@PAX@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A00001B) "extern "C" struct HBITMAP__ * __stdcall CreateCompatibleBitmap(struct HDC__ *,int,int)" (?CreateCompatibleBitmap@@$$J212YGPAUHBITMAP__@@PAUHDC__@@HH@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A00001C) "extern "C" struct HDC__ * __stdcall CreateCompatibleDC(struct HDC__ *)" (?CreateCompatibleDC@@$$J14YGPAUHDC__@@PAU1@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A00001D) "extern "C" int __stdcall GetSystemMetrics(int)" (?GetSystemMetrics@@$$J14YGHH@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2028: unresolved token (0A00001E) "extern "C" struct HDC__ * __stdcall GetDC(struct HWND__ *)" (?GetDC@@$$J14YGPAUHDC__@@PAUHWND__@@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall ReleaseDC(struct HWND__ *,struct HDC__ *)" (?ReleaseDC@@$$J18YGHPAUHWND__@@PAUHDC__@@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall DeleteObject(void *)" (?DeleteObject@@$$J14YGHPAX@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall BitBlt(struct HDC__ *,int,int,int,int,struct HDC__ *,int,int,unsigned long)" (?BitBlt@@$$J236YGHPAUHDC__@@HHHH0HHK@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" void * __stdcall SelectObject(struct HDC__ *,void *)" (?SelectObject@@$$J18YGPAXPAUHDC__@@PAX@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" struct HBITMAP__ * __stdcall CreateCompatibleBitmap(struct HDC__ *,int,int)" (?CreateCompatibleBitmap@@$$J212YGPAUHBITMAP__@@PAUHDC__@@HH@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" struct HDC__ * __stdcall CreateCompatibleDC(struct HDC__ *)" (?CreateCompatibleDC@@$$J14YGPAUHDC__@@PAU1@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall GetSystemMetrics(int)" (?GetSystemMetrics@@$$J14YGHH@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)
1>screenshoter.obj : error LNK2019: unresolved external symbol "extern "C" struct HDC__ * __stdcall GetDC(struct HWND__ *)" (?GetDC@@$$J14YGPAUHDC__@@PAUHWND__@@@Z) referenced in function "private: void __clrcall screenshoter::Form1::gdiscreen(void)" (?gdiscreen@Form1@screenshoter@@$$FA$AAMXXZ)

注意：我已经包含了所有需要的文件

我在MSDN中查找，但我无法理解错误消息。此外，我过去遇到过类似的消息，我解决了它但添加了一个.lib文件

这次我尝试添加，但它没有解决问题

#pragma comment( lib, "GdiPlus.lib" )

Answer 1

这些函数在gdi32.lib中声明 - 而不是gdiplus.lib - 有些可能在user32.lib中。

Answer 2

这些错误消息意味着您的代码（或者更确切地说，'screenshooter'代码）使用了“符号”（例如，可能是函数名称或变量），而没有代码链接到最终二进制文件中。

要解决此问题，请查找每个符号需要链接的库。例如，GetDC似乎是在user32.lib中定义的，因此请务必将其链接（可能使用#pragma指令，就像您对GdiPlus.lib所做的那样。）

截取屏幕截图C ++ cli

2 个答案: